Circuit Breaker
Single-pole switch controlled by an external signal.
Description
The Circuit Breaker unit simulates a single-phase circuit breaker that uses an external signal and current value to break an electrical circuit.
The table below shows how the external signal vT and the value of the Breaker Behaviour parameter determine the state of the block.
| Condition | Breaker Behaviour | Resistance used | |
|---|---|---|---|
vT < Threshold |
The switch is closed. Port 1 is connected to port 2. |
Closed Resistance |
|
vT ≥ Threshold |
Open when the current crosses zero after vT ≥ Threshold (Breaker Behaviour = |
When the current on port 1 crosses zero, that port is disconnected from port 2 (Breaker Behavior = |
Open Conductance |
Open when vT ≥ Threshold. |
The switch is open. |
||
Parameters
Closed resistance - resistance of the closed switch
1e-3 ohms (by default)
Resistance between ports 1 and 2 when the switch is closed.
Open conductance - open switch conductance
`1e-6 1/ohm (by default).
Conductance between ports 1 and 2 when the switch is open.
Threshold, V - threshold voltage
0.5 V (by default).
The threshold voltage for the vT control port. The block uses the value of this parameter as the value of the control signal at the start of the simulation to determine whether the breaker is initially open or closed. If the Breaker Behaviour parameter is set to zerocrossing, then when the voltage rises above the threshold, the breaker opens when the current crosses zero. If Breaker Behavior is set to simple, the breaker opens as soon as the voltage rises above the threshold value. When the voltage on the control port falls below the threshold, the breaker closes.
Breaker Behaviour - the behaviour of the switch when vT rises above the threshold value
zerocrossing (by default) | simple
Switch behaviour when the value on the vT control port is greater than or equal to the value of the Threshold, V parameter. The switch can open either as soon as the voltage rises above the threshold or when its current crosses zero.